Intersystem Crossing Outcompetes Triplet-Pair Separation from ¹(TT) below 270 K in Anthradithiophene Films.

ABSTRACT: Singlet fission (SF) and triplet-triplet annihilation (TTA) are processes which may be exploited to boost the efficiency of solar energy technology. Despite being studied since the late 1960s, the mechanism of singlet fission is still not fully understood. This is partly because the main technique used to study singlet fission, optical or visible/near-IR transient absorption spectroscopy, cannot distinguish between the strongly coupled triplet-pair state ¹(TT), weakly interacting triplet pairs (T..T), and independent triplet states T₁ + T₁. To solve this problem, we combine transient optical spectroscopy performed as a function of magnetic field and transient electron spin resonance (ESR) spectroscopy to probe the different steps involved in the singlet fis

SUBMITTER: Bu Ali EM 

PROVIDER: S-EPMC12356544 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature